Norway’s Oslo Opera House has a secret you can touch

How do you hide a secret message in public? First, create enormous dots. Second, place them on the roof of the Oslo Opera House in Norway. Third, repeatedly insist it’s absolutely not Braille. The secret’s out. I climbed that roof and read the writing on the wall. Artistic Braille can be tricky to read, but connecting the dots at the Oslo Opera House was unusually easy because of their shape,…